Subj : Re: timer thread & signal question
To   : comp.programming.threads
From : Joseph Seigh
Date : Fri Jan 07 2005 07:34 am

On 6 Jan 2005 20:07:13 -0800, VK <vkincaid@gmail.com> wrote:

> Hi,
>
> Please help me with this newbie problem.  I'm trying to set up a timer
> thread with the signal handler.  My problem is that when I have 2
> timers that go off at the same time, the signal SIGUSR2 is sent twice
> to sigwait(), but since they are 2 identical signals, sigwait() sees it
> as 1 signal only.  How do I tell sigwait() that there are 2 of the same
> signal?
>
> I tried sigwaitinfo() also as I thought sigwaitinfo() "returns the
> queued signal value so that applications can differentiate between
> multiple events queued to the same signal number".  But it didn't do it
> :(
>
> Can anyone please help me?  Thanks a lot in advance.  My test file is
> as below.
>
[...]

Don't use signals.  I don't know what you think receipt of the signals
mean since they're received *after* the times in question.

Use pthread_timedwait and then do a gettimeofday() or something to get
the current time since even pthread_timedwait has latency.  Process
whatever work needs to be done at that point.

Joe Seigh

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